CARES Annual Report 2017 | 19 Witness Status Arrest witness status has significant implications for patient outcomes, as witnessed arrests have more opportunity for bystander intervention and early delivery of care. Approximately half of arrests were unwitnessed (51.1%), while 36.6% were bystander witnessed and 12.3% were witnessed by a 911 Responder (Figure 8). Patients with a bystander witnessed arrest were more than 3 times as likely to survive their event compared with unwitnessed arrests (16.0% vs 4.6%, respectively; p